Exercise bicycle



FIG. 1 is a top, rear and side perspective view of the exercise bicycle.

FIG. 2 is a front view of the exercise bicycle.

FIG. 3 is a rear view of the exercise bicycle.

FIG. 4 is a right side view of the exercise bicycle.

FIG. 5 is a left side view of the exercise bicycle; and,

FIG. 6 is a top view of the exercise bicycle. 

CLAIM The ornamental design for an exercise bicycle, as shown and described. 